I've heard a rumor that if you install exotic hardwood floors, you
need to keep the humidity higher in the house, or the wood might
crack. (I live in Canada, where we have very dry winters).

I've been woodworking for years, and haven't heard about this -- is
this rumor true, or is it just a salesperson trying to disuade me from
what I really want (which is Jatoba BTW, but I'm interested in knowing
if this occurs in other types of wood too). Could this be a product
of how the wood is dried after harvest?

John